Roof Life Expectancy: How Long Roofs Last, by Source

What roof life expectancy means

Every roof covering wears out. Sun dries it, heat and cold move it, and rain and wind work at it. Roof life expectancy is a rough guide to how many years that takes for a type of roof.

The number is an average across many roofs. The National Association of Home Builders (NAHB) built its figures from a telephone survey of manufacturers, trade groups and researchers in 2006 ¹.

NAHB also noted that the people it spoke to stressed how much maintenance changes the result, and that people often replace parts of a home before, or after, the end of their practical life ¹.

So treat any lifespan as a starting point, not a forecast for your house.

Remaining roof life: the number that matters for your house

Remaining roof life is the useful life left on one specific roof. It starts from the expected life of the material, then adjusts for what an inspector can see.

Florida's state-backed insurer, Citizens, asks for this number on its roof inspection form.

The form has a line for "Remaining useful life (years)" next to the roof's age and material, and a checklist of signs of wear such as cracking, curling, granule loss and soft spots in the deck ⁴. A licensed professional must sign it ⁴.

Insurers also estimate it from data. Verisk, an insurance data firm, sells a Remaining Roof Life score that combines a roof's age, condition, material, shape and location ³. Verisk says its score is an estimate and does not replace a professional roof inspection where one is required ³.

Types: life expectancy by roof material

Each figure is labelled with its source. We only show numbers from sources we read.

Note that a trade group's figure for its own product, or for a rival product, may lean in its favor. The Metal Roofing Alliance promotes metal roofing.

Worked example: estimating remaining life

Illustrative only, to show the reasoning. A house has an asphalt shingle roof installed 14 years ago. Start from a source's figure, then adjust for what an inspector finds.

The paper estimate and the inspector's number can be far apart. The roof life calculator linked at the end of this page walks through the same steps with your roof's age, material and visible signs.

Where you see roof life expectancy

You will run into roof life numbers in four places. Roofers use them to plan a repair or a replacement. Home inspectors and roof inspectors write a remaining-life estimate into reports ⁴.

Insurers use roof age and remaining life to decide what to cover and at what price ³. And lenders and buyers ask about it during a home sale.

Some programs also tie their rules to it. For example, Kentucky's FORTIFIED grant program says that renewing a FORTIFIED designation usually needs an inspection showing the roof covering is still within its life expectancy ⁹.

Why knowing your roof's life expectancy helps

• You can save ahead for a replacement instead of facing it after a leak.
• You can time a replacement for good weather and a calm schedule, not an emergency.
• You can judge a repair quote: big repairs on a roof near the end of its life may not be worth it.
• You can answer insurer and buyer questions with an inspection report, not a guess.
• In Florida, a roof aged 15 years or more with an inspection showing at least 5 years of useful life left cannot be refused coverage on age alone ⁵.

Limitations of lifespan numbers

• They are averages. One roof can beat the number by years or fall short of it.
• Sources disagree. NAHB says about 20 years for asphalt shingles; the Metal Roofing Alliance says 12 to 20 ^{1 2}.
• Studies age. The NAHB figures come from a 2006 survey, and products have changed since ¹.
• They do not cover storms. One hail or wind event can end a roof's life early.
• They are not warranty terms. A warranty length is a promise from a maker, not a measured life.

How life expectancy drives cost

We do not quote prices here. Life expectancy changes what a roof costs you over time:

• A longer-lived material can cost more up front but be replaced fewer times while you own the home.
• The fewer years left, the less a repair is worth compared with a replacement.
• Insurers may change coverage or price for older roofs, and some settle older roofs at actual cash value.
• Tear-off adds labor. Most codes do not allow more than two roof coverings, so a second re-roof usually means removing both layers ⁸.
• Use our roof cost calculator for a starting range on your own roof.

What shortens or lengthens roof life

NAHB names four main factors: local weather, proper building and design, material quality, and maintenance ¹. In practice:

• Attic ventilation. ARMA says the lifespan of a roof can be directly affected by how it is, or is not, ventilated ⁶. Trapped moisture can condense on the cold deck and rot the wood ⁶.
• Ice dams. Warm attic air melts snow, which refreezes at the eaves and can force water under the roof ⁶.
• Sun and heat. Slopes that face the sun usually wear first.
• Installation. Nailing, underlayment and flashing done right let a material reach its expected life.
• Upkeep. Regular inspections and quick repairs catch small problems before they spread ⁷.
• Storms. Hail and high wind can cut a roof's life short at any age.

How to find your roof's remaining life

1. Find the install date. Look for the building permit, the roofer's invoice, or the seller's disclosure.
2. Identify the material. Asphalt shingle, metal, tile, slate or wood all have different expected lives.
3. Look from the ground. Use binoculars or a phone zoom to check for curling, cracking or missing pieces. Do not climb on the roof.
4. Check the attic. Look for daylight, water stains or damp wood under the deck.
5. Book a professional inspection. Ask the inspector to write a remaining useful life in years, as the Citizens form does ⁴.
6. Plan. If fewer than five years are left, start pricing a replacement.

Upkeep that helps a roof reach its expected life

ARMA, the asphalt roofing makers' trade group, says a qualified professional roofing contractor should inspect the roof routinely, usually in the spring and the fall ⁷. It also stresses that asphalt shingle roofs can be repaired, so a damaged area does not always mean a full replacement ⁷.

Between inspections, keep gutters clear so water drains off the edge, trim branches that rub the roof, and watch the ceiling for stains after heavy rain. Keep the attic vents open; ARMA links poor ventilation to deck rot and ice dams ⁶. Leave anything on the roof surface to a licensed roofer.

Risks of running a roof past its life

• Leaks that wet insulation, drywall and the wood deck, which turns a roof job into a bigger repair ⁶.
• Insurance trouble. Insurers flag roofs nearing the end of their life for more review ³.
• A harder home sale, if an inspector reports little remaining life.
• Shingles that blow off in a storm, because aged shingles can lose their bond to the course below.
• Losing the option to re-cover. Damaged or warped decking usually means a full tear-off ⁸.

Rules that use roof age or remaining life

No building code sets how long a roof must last. But some laws and programs use roof age or remaining life.

Florida Statutes Section 627.7011 says an insurer may not refuse to issue or renew a homeowner's policy solely because of the age of a roof that is less than 15 years old ⁵.

For older roofs, the insurer must allow an inspection, and may not refuse coverage based on age alone if an authorized inspector finds the roof has 5 years or more of useful life left ⁵.

The statute lists who may inspect, such as licensed home inspectors, building code inspectors, licensed contractors, engineers and architects ⁵.

Building codes also limit re-covering. ARMA notes that most codes do not allow more than two roof coverings on a building ⁸. Other states have their own insurance rules; check your state insurance department.

Life expectancy vs related terms

Common misconceptions

Myth A 30-year shingle lasts 30 years.

Reality The number on the wrapper is usually tied to a warranty, not a measured life. NAHB's survey figure for asphalt shingles is about 20 years ¹.

Myth If it is not leaking, it has plenty of life left.

Reality Wear such as curling and granule loss shows up before leaks. An inspection finds it ⁴.

Myth Every roof in my area lasts the same.

Reality Ventilation, installation and upkeep differ from house to house, and so does life ¹.

Myth An old roof must be replaced right away.

Reality Not always. In Florida, an inspection showing 5 or more years of life can keep coverage on an older roof ⁵.

How climate and local rules change it

NAHB puts local weather first on its list of what decides a roof's life ¹.

Hot, sunny places bake asphalt; cold places bring ice dams ⁶; coastal places bring wind and salt. Your state's insurance rules also change what roof age means for your policy.

Florida's 15-year and 5-year rules are one example ⁵. We do not publish lifespans by city or state, because we have no measured source for them.

A local roofer or inspector who sees your roof is the best guide.

When it matters and what to do next

• Buying or selling a home: get a written inspection with a remaining life in years.
• Your roof is within five years of its expected life: start getting quotes and saving.
• Your insurer asks about roof age: send an inspection report, not just the install date.
• After a big storm: have the roof checked, because damage can end its life early.

Keep going

• Roof life calculatorEstimate your roof's remaining life
• Repair or replace?Decide what to do with an aging roof
• Roof inspectionGet a written condition report
• Roof replacement windowOur research on when roofs get replaced
• Roof ventilationWhy attic airflow matters for roof life

Related terms

Roof Inspection Report

A roof inspection report is the written record of a roof inspection: what parts of the roof were looked at, how they were looked at, what defects were found, photos of those defects, and what the inspector recommends doing next.

Roof Certification

A roof certification is a signed document from a qualified roofer or inspector stating that a roof is in sound condition on the day of inspection and estimating how many years of useful life it has left.

Asphalt Shingles

Asphalt shingles are roofing pieces made from a fiberglass mat coated with asphalt and topped with mineral granules, laid in overlapping rows so water runs off the roof.

Metal Roofing

Metal roofing is a roof covering made of metal sheets, panels or shingles, most often steel, aluminum, copper or zinc, fastened to the roof deck to shed water, snow and sun.

Slate Roofing

Slate roofing is a roof covering made of thin pieces of natural stone, split from quarried slate rock and nailed to a solid roof deck in overlapping rows.

Roof Ventilation

Roof ventilation is the system of vents that lets outside air enter an attic low, near the eaves, and leave high, near the ridge, so heat and moisture do not build up under the roof deck.

Reroofing

Reroofing is the work of putting a new roof covering on a house that already has one, either by tearing the old covering off down to the deck (a replacement) or by laying the new covering over the old one (a recover, often called an overlay).

Roof Warranty

A roof warranty is a written promise to repair or pay for certain roof failures for a set time.

Actual Cash Value

Actual cash value (ACV) is the way a homeowners policy values damaged property at what it was worth just before the loss: the cost to replace it today minus depreciation for its age and condition.

Also referenced from: Roof Inspection Report, Roof Certification, Actual Cash Value, Replacement Cost Value, Roof Warranty, Manufacturer Warranty